kactivitymanagerd in Ubuntu 16.04 ?

you can use the rdepends option to see what packages depends on it and you can see why it is installed

@ actionparsnip (andrew-woodhead666) :

I tried:
$ apt-cache rdepends kactivitymanagerd
E: No packages found

Then tried:
$ apt search kactivitymanagerd
Sorting... Done
Full Text Search... Done
(Nothing was found)

Then tried:
$ apt search "activitymanager"
Sorting... Done
Full Text Search... Done
plasma-widget-activitymanager/xenial 0.5-0ubuntu1 amd64
  activity manager for KDE

So I checked dependencies but nothing was found:
$ apt-cache rdepends plasma-widget-activitymanager
plasma-widget-activitymanager
Reverse Depends:

The following command shows that the package is installed.:
$ apt show plasma-widget-activitymanager
Package: plasma-widget-activitymanager
Version: 0.5-0ubuntu1
Priority: extra
Section: universe/kde
Origin: Ubuntu
<... more ...>

But ...:
$ dpkg -L plasma-widget-activitymanager
dpkg-query: package 'plasma-widget-activitymanager' is not installed
Use dpkg --info (= dpkg-deb --info) to examine archive files,
and dpkg --contents (= dpkg-deb --contents) to list their contents.

What is the output of:

dpkg -l | grep manager

Thanks

@actionparsnip (andrew-woodhead666) :

Here it is:

$ dpkg -l | grep manager
ii a11y-profile-manager-indicator 0.1.10-0ubuntu3 amd64 Accessibility Profile Manager - Unity desktop indicator
ii activity-log-manager 0.9.7-0ubuntu23 amd64 blacklist configuration user interface for Zeitgeist
ii apt 1.2.15 amd64 commandline package manager
ii compiz 1:0.9.12.2+16.04.20160823-0ubuntu1 all OpenGL window and compositing manager
ii compiz-core 1:0.9.12.2+16.04.20160823-0ubuntu1 amd64 OpenGL window and compositing manager
ii compiz-gnome 1:0.9.12.2+16.04.20160823-0ubuntu1 amd64 OpenGL window and compositing manager - GNOME window decorator
ii compiz-plugins-default:amd64 1:0.9.12.2+16.04.20160823-0ubuntu1 amd64 OpenGL window and compositing manager - default plugins
ii file-roller 3.16.5-0ubuntu1.2 amd64 archive manager for GNOME
ii gnome-power-manager 3.18.0-1ubuntu1 amd64 power management tool for the GNOME desktop
ii liba11y-profile-manager-0.1-0:amd64 0.1.10-0ubuntu3 amd64 Accessibility profile manager - Shared library
ii liba11y-profile-manager-data 0.1.10-0ubuntu3 all Accessibility Profile Manager - GSettings data
ii libcgmanager0:amd64 0.39-2ubuntu5 amd64 Central cgroup manager daemon (client library)
ii libkf5windowsystem-data 5.18.0-0ubuntu1 all Convenience access to certain properties and features of the window manager
ii libkf5windowsystem5:amd64 5.18.0-0ubuntu1 amd64 Convenience access to certain properties and features of the window manager
ii libmetacity-private3a:amd64 1:3.18.7-0ubuntu0.2 amd64 library for the Metacity window manager
ii libpam-systemd:amd64 229-4ubuntu12 amd64 system and service manager - PAM module
ii libproxy1-plugin-networkmanager:amd64 0.4.11-5ubuntu1 amd64 automatic proxy configuration management library (Network Manager plugin)
ii metacity-common 1:3.18.7-0ubuntu0.2 all shared files for the Metacity window manager
ii modemmanager 1.4.12-1ubuntu1 amd64 D-Bus service for managing modems
ii nautilus 1:3.18.4.is.3.14.3-0ubuntu5 amd64 file manager and graphical shell for GNOME
ii nautilus-sendto 3.8.2-1ubuntu1 amd64 integrates Evolution and Pidgin into the Nautilus file manager
ii network-manager 1.2.2-0ubuntu0.16.04.3 amd64 network management framework (daemon and userspace tools)
ii network-manager-gnome 1.2.0-0ubuntu0.16.04.4 amd64 network management framework (GNOME frontend)
ii network-manager-pptp 1.1.93-1ubuntu1 amd64 network management framework (PPTP plugin core)
ii network-manager-pptp-gnome 1.1.93-1ubuntu1 amd64 network management framework (PPTP plugin GNOME GUI)
ii python3-update-manager 1:16.04.4 all python 3.x module for update-manager
ii systemd 229-4ubuntu12 amd64 system and service manager
ii systemd-sysv 229-4ubuntu12 amd64 system and service manager - SysV links
ii update-manager 1:16.04.4 all GNOME application that manages apt updates
ii update-manager-core 1:16.04.4 all manage release upgrades

I don't find an option to attach a file.

A search on http://packages.ubuntu.com/search?suite=xenial&arch=any&searchon=contents&keywords=kactivitymanagerd shows a package name of kactivities for that file on Ubuntu 16.04

I have hit exactly this problem on Kubuntu 16.04. kactivitymanagerd is holding to a directory (not a file) on a mounted CIFS network share, so that I cannot mount it because it is busy. Is there a way to disable this whole KDE Activity thing?